JVET-P0894 Preliminary text for Annex A: Profiles, tiers and levels [J. Boyce (Intel)]
Discussed in plenary Sunday 6 October 1645 (GJS & JRO)
Preliminary text is proposed for Annex A: Profiles, tiers and levels, as a starting point for further discussion and study. Two initial profiles are proposed: Main 10 and Main 4:4:4 10. Tiers and levels are copied from HEVC.
The proposed Main 10 profile includes support for 4:2:0 and monochrome, and the proposed Main 4:4:4 10 profile adds support for 4:2:2 and 4:4:4.
No coding tools currently included within the specification are excluded from the proposed profiles.
The two tiers from HEVC are included – High and Main. The levels parameters are copied from HEVC, and have the same resolutions and bitrates. maxDpbPicBuf is increased to 7 from 6 in HEVC.
Some issues requiring additional discussion (not comprehensive):
- Level bitrate limits
- Subpictures
- Max number and/or minimum size
- Bitrate limits per subpicture
- Bin limits (based on bitrate or absolute?)
- Reference picture list size limits
- Reference picture resampling ratio restrictions
- Numbering scheme for profiles. (Share general_profile_idc value for multiple profiles, as in RExt?)
It was discussed whether 4:2:2 should be supported in a 4:4:4 profile.
Decision: Adopt, but with a maxDpbPicBuf of 8 rather than 7 (see the notes for JVET-P0133).